v3.18.1 — Operator board menu fixes

Fixes to the ⋯ menu on the operator Boards tab.

• Delete board works on empty boards. On a faded (empty) row, the next row covered the open menu, so clicking Delete board… opened that board instead. The row with an open menu now sits above the rows below it.
• ⋯ opens the menu, not the board. The row's link stops short of the ⋯ button.
• No ⋯ showing through an open menu. The next row's button no longer paints over the dropdown.

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